cfg80211: Scan results to also report the per chain signal strength

This commit enhances the scan results to report the per chain signal
strength based on the latest BSS update. This provides similar
information to what is already available through STA information.

Signed-off-by: Sunil Dutt <usdutt@qti.qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Git-commit: 983dafaab799511e092ffd006f3a064b37ccbccf
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


CRs-fixed: 2173940
Change-Id: I4300c1a6a3af4dc1244ee4717a772bfaa927b2db
Signed-off-by: Srinivas Dasari <dasaris@codeaurora.org>